package org.douxiaoban.client.adapter;

import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;

import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;

/**
 * Created by IntelliJ IDEA.
 * User: huangzhongkun
 * Date: 11-6-22
 * Time: 上午1:16
 */
public class AsyncImageLoader {
    private HashMap<String, SoftReference<Drawable>> imageCache;

             public AsyncImageLoader() {
                 imageCache = new HashMap<String, SoftReference<Drawable>>();
             }

             public Drawable loadDrawable(final String imageUrl, final ImageCallback imageCallback) {
                 if (imageCache.containsKey(imageUrl)) {
                     SoftReference<Drawable> softReference = imageCache.get(imageUrl);
                     Drawable drawable = softReference.get();
                     if (drawable != null) {
                         return drawable;
                     }
                 }
                 final Handler handler = new Handler() {
                     public void handleMessage(Message message) {
                         imageCallback.imageLoaded((Drawable) message.obj, imageUrl);
                     }
                 };
                 new Thread() {
                     @Override
                     public void run() {
                         Drawable drawable = loadImageFromUrl(imageUrl);
                         imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));
                         Message message = handler.obtainMessage(0, drawable);
                         handler.sendMessage(message);
                     }
                 }.start();
                 return null;
             }

            public static Drawable loadImageFromUrl(String url) {
                URL m;
                InputStream i = null;
                try {
                    m = new URL(url);
                    i = (InputStream) m.getContent();
                } catch (MalformedURLException e1) {
                    e1.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                Drawable d = Drawable.createFromStream(i, "src");
                return d;
            }

             public interface ImageCallback {
                 public void imageLoaded(Drawable imageDrawable, String imageUrl);
             }

}
